IIS not serving up .dat files.

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+1 Q:

IIS not serving up .dat files.

Hi all,

I have a ASP MVC web application that uses a plugin to load images and points for a 3d application.

When debugging with the the Visual Studio development server the images and the points are served up great...

http://i148.photobucket.com/albums/s19/littleniv/Debugging/local.png

Second image: same url but iis.png

When running in IIS 7 though the .Dat point files do not serve and produce a 404.

I've noticed the caching is marked as private in fiddler, but i don't know what this means. Can anyone help?

Cheers,

Stu

+5 A:

It's been a while, but I have seen a similar issue in IIS 6. IIS by default will only serve a file if it is configured to serve it based on the extension and mime type.

Go into the IIS Manager, click on the server, then open up "MIME Types" under the IIS Area. Hit "Add..." in the upper right corner (under actions), and type in your extension (".dat") and a mime type (depends on your data; maybe "application/octet-stream"?).

Once you've done that, you should be able to download the files.

Chris Shaffer 2010-04-22 17:07:04

thanks for the answer. I already just did that, but after I've added it it seems to strip off the css stylesheet then throws a error saying i can't add a duplicate mime map, when their isn't an entry in it in the IIS mime types. Could it be possible the application is setting it somewhere already?

Stu 2010-04-22 17:13:58

Another point, i checked the iis logs and it is a 404.3, which i think is definitely a mime type problem..http://technet.microsoft.com/cs-cz/library/cc753281(WS.10).aspx

Stu 2010-04-22 17:22:41

I'm a bit confused - did you get an error adding the new MIME type, or is this an application error?

Chris Shaffer 2010-04-22 17:27:02

Sorry, I had added it at website level previously and tried to add it at application level. They mime type is set correctly to application/octet-stream, but i still get the 404.3 and it is still showing in fiddler as text/html charset utf-8Here is a line from the IIS log2010-04-22 17:30:00 192.168.1.100 GET /NBPortal/Content/TruViews/Pnt_5_1024.DAT - 80 stu 192.168.1.100 Mozilla/4.0+(compatible;+MSIE+8.0;+Windows+NT+6.1;+WOW64;+Trident/4.0;+SLCC2;+.NET+CLR+2.0.50727;+.NET+CLR+3.5.30729;+.NET+CLR+3.0.30729;+Media+Center+PC+6.0;+.NET4.0C;+.NET4.0E) 404 3 50 2

Stu 2010-04-22 17:32:38

OK. Apparently the 404.3 50 error is ERROR_NOT_SUPPORTED. Can anyone shed any light?

ALL STOP!!!

I added a static file handler mapping and everything is solved. Many thanks to Chris for helping me run through some trouble shooting. I'll mark you as the answer as you are the only one that helped!! Thanks again!!

Eek. I have multiple accounts on SO... this is going to take some sorting out!

Stu 2010-04-22 17:49:23

ansaurus

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IIS not serving up .dat files.

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